Recent expansion led to the lack of genetic structure of Sargassum aquifolium populations in Southeast Asia
Publication in refereed journal

香港中文大學研究人員

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摘要Phylogeographical study of the brown macroalga, Sargassum aquifolium using nuclear internal transcribed spacer 2, plastidal RuBisCo spacer, and mitochondrial cytochrome oxidase subunit-III revealed the populations in Southeast Asia to be homogeneous. On the other hand, genetic differences were detected between populations from Southeast Asia and western Pacific Islands/Guam, suggesting the presence of genetic break between these regions. This further suggests that populations of S. aquifolium may have survived east of Sunda Shelf during the Last Glacial Maximum and recent recolonization led to homogeneity of the populations in the Sunda Shelf region. Recolonization could be facilitated by year-round reproduction of the populations and dispersal of germlings on floating thalli by coastal currents. Restricted current flow across Maluku Sea and directional equatorial current flows could have isolated the Pacific Island and Guam populations from those of Southeast Asia. Our results support the presence of multiple refugia as the source of different lineages of S. aquifolium populations with a lack of secondary contact in the post-glacial dispersal between Southeast Asia and western Pacific as the mechanisms behind the phylogeographical patterns observed.
著者Chan SW, Cheang CC, Yeung CW, Chirapart A, Gerung G, Ang P
期刊名稱Marine Biology
出版年份2014
月份4
日期1
卷號161
期次4
出版社SPRINGER
頁次785 - 795
國際標準期刊號0025-3162
電子國際標準期刊號1432-1793
語言英式英語
Web of Science 學科類別Marine & Freshwater Biology; MARINE & FRESHWATER BIOLOGY

上次更新時間 2020-27-05 於 03:59